Billionaire right-leaning icon David Koch, who has been suffering from deteriorating health, has died at age 79.

Charles Koch released a statement announcing his brother’s passing.

“It is with a heavy heart that I announce the passing of my brother David,” the sibling said in the statement. “Anyone who worked with David surely experienced his giant personality and passion for life. Twenty-seven years ago, David was diagnosed with advanced prostate cancer and given a grim prognosis of a few years to live. David liked to say that a combination of brilliant doctors, state-of-the-art medications and his own stubbornness kept the cancer at bay. We can all be grateful that it did, because he was able to touch so many more lives as a result.”

As noted by CBS News, David Koch was less involved in politics than brother Charles.

Known more for his philanthropy to education and the arts, particularly ballet, David gave $100 million to renovate the New York State Theater in Lincoln Center — which was renamed for him — and committed millions for cancer research, according to CBS News.

The Koch brothers are hated on the left and regularly vilified for funding Americans for Prosperity, a libertarian/conservative political advocacy group that pushes lower taxes, less government regulation and economic prosperity for all.

The reaction online to the younger Koch brother’s death from the unhinged left is a case study in evil personified:

David Koch has died. In lieu of flowers please construct a shadow network of tax deductible shell companies to donate to the further perpetuation of environmental destruction and income inequality.

When a bad person dies they don’t suddenly become a saint. Their legacy of destruction and pain doesn’t just float away. David Koch is dead, we have to deal with the fallout of his villainy for hundreds of years. So he donated to a museum. So fucking what?

Honestly reading that one of the #KochBrothers has died worries me. They are the enemy we know. While there is still one left tell me there isn't going to be a power vacuum of some kind. What will rise in his place?

This cabal was not above using his brother’s passing to go after Charles Koch — though we can be relatively sure that he doesn’t spend his day perusing the toxic wasteland of Twitter consumed with what social media users on the left think of him.

I was wondering why I awoke with such a strange feeling of powerfulness today… I have absorbed his life form overnight. Charles Koch you’re fucking next bitch https://t.co/OuXI6cr9hw

Here’s a couple of early responses from more responsible members of our society, Sen. Rand Paul, R-Ky., and Secretary of State Mike Pompeo:

RIP to a man who lived a life of liberty, peace and philanthropy. Great blessings being great responsibility, and David Koch lived that way. His many contributions will have lasting impact on our country. My thoughts are with his family today.

I was saddened to hear of the passing of David Koch. He was a compassionate philanthropist, successful businessman, and a proud American. I send my prayers to the Koch family during this difficult time.